Vault cover



FIG. 1 is a top, left side, front perspective view of a vault cover showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a left side elevation thereof, the side opposite being a mirror image;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a vault cover, as shown and described. 